Hey Mark how’s it going?
Even though you have multiple computers, mining Bitcoins with them will probably be useless. It’s impossible to make a profit today if you’re not mining Bitcoins with designated miners known as ASIC miners.
If you want to dig deeper into this read this post about Bitcoin mining profitability.
What I can suggest is that you find a different coins that can be mined with a CPU. I’m not much into altcoin mining so I can’t really suggest anything here but I’m sure a quick Google search will do the trick.
Good luck!
Ofir